Plasticiser for cellulose plastics



'3 of New Jersey,

reamed an 17, ea.

nmnraaan n. s'r: .ronu, or

intent MAPLEWOJOD, NEW JERSEY.

PLASTIGISEE FUR CELLUJLOSE PLASTIICS.

lilo Drawing.

To allwhom it may concern.

L'ABGH BALD D. ST. JOHN, a citizen of the United States, and aresidentof the town of Maplewood, county of Essex, and State have invented a newan llmproved Plasticiser for Cellulose Plastics,

of which the following is a exact description.

My invention relates to a solvent for cellulose esters and particularlytoorganic phosphates used for the purpose.

At present triphenylphosphate and tricresyl phosphate are the best knownand most widely used. {Of the two mentioned,

tricresylphosphate is liquid at ordinary temperature and is thereforeused in preference to the triphenylphosphate for some purposes.

The raw material for tricresylphosphate is cresol, a natural product,which is less pure and more expensive than phenol. If there fore,triphenylphosphate were liquid it would be preferable totricresylphosphate,

and more economical from a manufacturing standpoint.

l have found, by experiment, that I can produce a mixedphenyl-cresylphosphate containing one or more molecules of cresol and ofphenol, one of which possesses the physical advantages oftricresylph'osphate, with as easy a purification and cheapness of rawmaterial as triphenylphosphate. By mixed is meant that the phosphateradical is in combination with both phenyl and cresyl radicals. Thesolvent which has substantially the property of tricresylphosphate issupposed to be mono-cresyl-di-phenylphosphate and may be prepared bymixing one molecular weight'of ortho cresol with two 7 molecular weightsof phenol to obtain a homogeneous solution; then treating the mixturewith one molecular weight of phosphorous pentachloride, the result beinga mixed cresyl-phenyl phosphite chloride.

An addition of water decomposes the substance with the evolution ofhydrogen chloride, the result of the reaction being the subfull, clear,and.

similar article. lln

Application filed may 22, 1922. Serial Ito. 562 313.

stance, the 'fnono-cresyl-di-phenyl phosphate. It may be purified bywashing with water and dilute alkali solution. v Myplasticiser has aprobable structure of GJELCH,

- (3 H, PO,

and is liquid at ordinary temperature. lit boils at atmospheric pressureat about 400 degrees C, with not more than slight decomposition of thesubstance.

My plasticiser can be used in the same way asplasticisers hitherto knownhave been used and the amount of cellulose esters to be added will varyaccording to whether it is used in celluloid. lacquer, artificialleather or general, it may be stated that from 20% to 35% of thesubstance in my disclosure can be mixed with 80 to of the celluloseesters. and can also be used 1n con unction with cellulose esterssoftened with camphor, or, in place of camphor, triphenylphosphate orother solvents; in which case, the proportion of my solvent will vary.

ll claim:

1. As a new plasticiser, a mixed cresylphenylphosphate.

2. Asa new plasticiser, mono-cresyl-di-y phenylphosphate. V

3. As a new plasticiser, mono-cresyl-diphenylphosphate, liquid atnormal-temperature and pressure. 7 4., A plasticiser, a mixedcresyl-phenylphosphate, liquid at normal temperature and pressure.

5. A plasticiser, a compound, the probable structure of which is a 5 s sand a liquid at ordinary temperature which boils with not more thanslight decompositlon at atmospheric pressure at about 400 degrees C.

ARCHIBALD D. S'll. JOHN.

